Op donderdag 17 april 2014 09:34:52 UTC+2 schreef Tassilo Horn: > > Stanislas Nanchen <stanisla...@gmail.com <javascript:>> writes: > > > You miss one parentheses at the end of your expression > > > > (defn boolean [x] > > (if (and (nil? x) (false? x)) > > )) > > And now you have an if without then which will give you another > exception. And the test expression is a contradiction, i.e., it's > always false. Nothing can be both nil? and false?. >
You are right. Stupid thinking error of me. > > > I have to check if x is a nil or false and then the output must be > > false,\ Otherwise I have to be true. > > Why? nil and false are already falsy, everything else is true. And if > you have to interact with java where some method wants some "real" > boolean, then there's already clojure.core/boolean. > > In this exercise you are not allowed to use boolean. Roelof > Bye, > Tassilo > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
